Hand rock-drill.



Z SHEETSSHEET 1.

INVENTOR 7 9 NW Q WITNESSES: 69M 4? ATTORNEY ,PATENTED FEB. 4, 1908.

G. F. PAUL, JR. HAND ROCK-DRILL.

APPLICATION FILED JUNE 21. 1906.

2 SfiEETS-SHEET 2.

ITED STATES PATENT OFFICE.

CHRISTIAN F. PAUL, JR, OF PEEKSKILL, NEW YORK, ASS IGNOR TO THE PAUL & KREUGER ROCK DRILL COMPANY, A CORPORATIONOF NEW YORK.

HAND ROCK-DRILL.

To all whom it may concern: Be it known that I, CHRISTIAN F. PAUL, Jr., a citizen of the United States, and resident of Peekskill, in the county of Westchester and State of New York, have invented certain new and useful Hand Rock-Drills, of which the following is a specification.

This invention relates to rock drilling, and its object is to provide an eflicient hand- 0 crating machine for that purpose, which ,oiiject is attained by the means set forth in these specifications and the accompanying drawings, in which like letters refer to similar parts throughout the several views.

Figure 1, Sheet 1, is a perspective view of the machine, Fig. 2 is a plan of the machine.

Fig. 3 shows the tripod swivel attachment.

Fig. 4 shows the tripod swivel clamp. Fig. 5 is a top view of the drill rotator. Fig. 6 is explanatory of Fig. 5. Fig. 7, Sheet 2, illustrates the action of the yoke. Fig. 8 is explanatory of a quick-stroke gearing. Fig. 9 1s a side, partly sectional, view of the box A and the mechanism therein. Fig. 10 illustrates the movable crank-pin. Fig. 11 shows the crank-disk without the crank-pin.- Fig. 13' is an edge view of the crank disk. Fig. 14 is a side view of the parts i, j., Figs. 10 11; Fig. 15 is an inside edge view of the arts i, 7'. Fig. 16 illustrates the action 0' the movable crank-pin.

The machine as shown in Fig. 1, on tripod supports 38, comprises a box or casing A that contains the operating devices, and has grooves 10 10 on its sides, adapting it to slide on the guide rails 11 11, which are held together by cross-bars 12 12 and the plates 13 in the center. The'upper cross-bar supports a nut 14 threaded for the screw 15. A nut 14, Fig. 3, on the under side of the box receives said screw, and by means of a crank '16, Fig. 1 on the screw, the box is moved upon the rails The swivel attaching the boxA to the tripod is shown in Fig. 3. A disk 17 has an offset flange on its periphery, as in 13g. 4, the i plates 13 13 have reverse recesses to receive the disk, as at 13. -Th larger rim of the disk lies next the rails 11, and tightening the bolts 18, 18, draws the plates together and holds the machine from turning- The lugs 20 20 are integral with the disk, andsupports a shaft 7! for the tri 0d legs. v

The interior of the machine is disclosed in Figs. 2 and '9. A disk g'revolving' on a shaft Specification of Letters Patent. Application filed June 21. 1906i Serial No. 3221 I revolve on shaft e.

- Patented Feb. 4:, 1908.

"Z I C has & k in' p engaging witha yoke y.

A block f affords a bearing for the crankin and travels in the curved slot in the yoke. The vertical slot'jl in the yoke incloses the shafts e e, and the shafts guide the vertical movement of the yoke.

The machine is driven by a crank 19, Fig. 1, on the shaft e (or it may be driven by a motor). Fig. 9 shows the transmission of motion from the crank to the yoke. The shaft-e is fast in the Wheel m. The pinion m and wheel m are fast on shaft e. The pinion m and disk 9 are secured together and The two shafts have bearings Z Z in the box A. The gears are proportioned to give the disk five revolutions to one of the crank. I

The action of the yoke y is shown in 7, l

where it is seen ready for a downward stroke. The curved slot in the yoke is a quadrant, and pitched in relation to its vertical movement, so that radii from its curves will meet in a center in a vertical plane with the center of the crank-pin when at the position d. As the crank-pin moves from the position at a to the position at b the yoke will move from a to b, which exceeds the crank movement by the distance from b to c. As the crank pin moves from the position at b it begins to ift the yoke, and in completing the quarterstroke from b to 0 will lift the yoke from b to 0. Through the next quarter-revolution the yoke will be lifted from c to d, and in the next quarter from d" to a. Thus, through threeuarters of its revolution the crankpin wil lift the yoke, and through its last quarter will recipitate the yoke quickly the full length 0 its down stroke: a movement representing the slow lifting of a hammer and its quick throwing down. Fig. 2 shows the yoke at the end of its down stroke. Especial advantages are derived from the gearing shown in Figs. 2 8 and 9. Referring to Fig. 8, the pinion m is eccentric to its shaft, and the driver m is adapted to engage with the pinion and to give to it three revolutions to one of the wheel, the wheel accordingly having three elliptical divisions. From one high point to the next high point, or vice versa, causes a revolution of the pinion. When the wheels are in the position shown the pinion, following the arrows, is entering its period of maximum velocity. Simultaneously the crank-pin is at a, and during the rapid movement of the pinion the crankpin will be moved from a to b, which is during the descent of the yoke. While lifting the yoke the short axes of the wheel will engage with the long axes of the pinion, thus easing the lifting operation. The objects and effects of'the gearing are to facilitate the lift ing of the yoke, to accelerate its precipitation, and make a steadier pull upon the handcrank.

Evidently, an obstruction of the full downstroke of the yoke might result in a re-action injurious to the machine; To avoid this the crank-pin is adapted'to move towards the center of the disk, as shown in Figs. 10 to 15, inclusive. In Fig. 10 the crank-pin 70 is shown as secured in a block it that .moves on V guides 1 1' in a slot'in the disk. Fig. 12 shows the block in perspective. The slot has a closure *5, y', held in place by screws 8 8, Fig. 11. Fig. 13 is an edge View of the disk without the'closure or block, and Figs. '14 15 .show the form of the closure. Springs 6 6 in recesses 3 3 in the disk, Fig. 11 keep the block in normal position as shown in Figs. 2, l0 and l6.

Fig. 16 illustrates what would'occur if the yoke failed to complete a down-stroke, by

. reason of the drill gettin fast, or other cause.

Fig. -7 shows that w ile the yoke is descending the travel of the block f is about perpendicular, which allows the block a little iberty of movement, at the end of which, if the yoke does not rise at once, the block it moves centerward of the disk, as in Fig. 16. If the line 00 should. indicate the end of the stroke, but it had stop ed at :c, the block h would move from the liroken line at to the solid line x, and would begin to lift the yoke, and if the movement of the block did not overcome the resistance of the drill the yoke would still move by reason of the yield- 1n connection of the yoke with the drill spindle. If this giving of the two yieldingparts did not release the drill, the machine would come to a stop without shock or injury.

{[he yoke has a spindle terminal 3 Figs. 2 arid 9 with a head 8 at its extremlty. The

receivethe spindle 'y" and a s ring 8. that surrounds the spindle. A bus ing 1' in the bore compresses the spring betwe n the bushing and the head 8. 'If the dr'll does not promptly res 0nd to'the lifting of the yoke the head 8 is. ifted against the spring, and the machine is relieved from sudden shock.

The tube projection n on the box A affords a bearing for the drill spindle n, and contains means for rotating the drill-spindle. The inner diameter of the tube is larger than-the drill-spindle, the lower outlet being adapted to the spindle by a bushing 0, Figs. 2 and 9. On the drill-spindle is a collar 8, Fig. 9, having rollers u on its face, shown in plan in Fig. 5. On the inner surface'of the tube are cam-grooves in which the said rollers travel.

the paths of the rollers.

Fig. 6 represents the tube opened out showing the formation of the grooves. The circles within the grooves represent the changing positions of the rollers, and the broken lines At 50 the roller is on a downward stroke; the point w of the projecting surface to will cause it to move to the groove 51. On the return stroke the point e of the projecting surface 1) will divert the roller to the groove 52, so that with every complete stroke of the yoke the rollers advance from one upper groove to the next one, the drill making a complete revolution with every five strokes.

Except in the application of power to the machine, it is to be handled-the same as the ordinary rock-drills.

Having described my invention, what I claim and desire to secure-by Letters Patent,

motionto the drill, and a varia le speed gearing for operating the yoke comprising an eccentric wheel and a wheel adapted to engage with the eccentric wheel for driving the same.

2. In a hand rock drill the combination with a yoke for imparting a reciprocating motion to the drill, of a crank for giving motion to the yoke, said crank havin a movable crank-pin comprising a crank disk, a slot in the disk, a movable block in said slot, the crank-pin secured in the movable block, and springs bearin against the block to retain it in its norma position in the slot.

' 3. In a hand rock drill the combination with a yoke for im arting a reci rocating motion to the dril of the drill spindle swiveled to the end ofthe yoke, and aspring within the drill-spindle actingluponkthe yolrlae yo e-spm e the drill, the yoke having a quadrant sha ed slot for the crank connection, the slot pitc ed drlll spmdle n has a bore in its upper end to I from a horizontal so that radii from its curves will meet in a center in avertical plane with the center of the crank-pin when the crankpin is at its left center, and a variable a reciprocating In tion to the drill, a movable crank-pin compr ing a crank-disk a slot in the crank-d1sk,'a movable block in said slot,

the crank-pin secured in said block, and springs bearing against the block to retain i in its normal osition.

6. In a roc drill the combinationof a curved yoke for givin motion to the drill, a

yielding crank-pin in't e crank operating the yoke, and an elastically swiveled connection connection of the yoke with the drill spindle, between the oke and the drill spindle. and means for rotating the drill.

7. In a roc drill the combination with a Signed at Peekskill in the county of Westcurved yoke and a crank for imparting mochester and State of New York this 16th day' 5 tion to itrhe drill, 1geaging f0}; tranimittirlig of June A. D. 1906. I

motion 0m t e. an cran to t e o e comprising in the train an eccentric wleel, CHRISTIAN PAUL a driving Wheel adapted to engage Withthe I Witnesses: eccentric Wheel, a ylelding crank-pin in the CHESTER R. WOOD,

10 yoke driving crank and a swiveled yielding GEO. H. WOOD. 

